Ten construction workers will often get a job done faster than one. But in digging a deep well, for instance, ten workers are a waste of human resources: the diggers can’t work simultaneously, as the second worker isn’t able to start digging until the first one has finished, and so on.
A similar challenge is encountered by scientists who study the structure and dynamics of molecules using nuclear magnetic resonance (NMR) spectroscopy. This technique serves as an essential tool in understanding numerous molecules – including proteins, nucleic acids and active pharmaceuticals – in their natural surroundings. It does this by exposing them to electromagnetic radiation and studying the dispersion patterns of the electromagnetic waves that hit the molecules. However, to obtain a full NMR picture of such complex molecules one needs to perform numerous measurements that are based on the same “serial” principle as well digging: hundreds or thousands of one-dimensional scans need to be performed one after the other; these scans need then to be combined to create a unified multidimensional picture of the molecule. While a single scan may take a fraction of a second, multidimensional procedures may last several hours or even days.
A team led by Prof. Lucio Frydman of the Weizmann Institute’s Chemical Physics Department has now found a way to perform multidimensional NMR with a single scan. The new method, described in the December 2002 issue of the Proceedings of the National Academy of Sciences USA (PNAS), is expected to significantly speed up molecular studies routinely performed in diverse fields.
Alex Smith | EurekAlert!
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With a quantum coprocessor in the cloud, physicists from Innsbruck, Austria, open the door to the simulation of previously unsolvable problems in chemistry, materials research or high-energy physics. The research groups led by Rainer Blatt and Peter Zoller report in the journal Nature how they simulated particle physics phenomena on 20 quantum bits and how the quantum simulator self-verified the result for the first time.
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